I just removed panel board that was glued to drywall and the glue is still on the paper. so when I try to sc**** off the glue it frays the paper. I have tried peeling of the loose edges but is taking forever. Should i try to sand off old glue? What about useing a wet sanding sponge on paper. The drywall was never painted before the panel board was glued to it. I want to be able to just skim coat the drywall and then paint. I don't want to replace drywall because then I would have to tape cieling joint and the stippling would never match.